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      JS编写位置
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        <h2 id="button标签中的onclick"><a href="#button标签中的onclick" class="headerlink" title="button标签中的onclick"></a>button标签中的onclick</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;button onclick=&quot;alert(&apos;警告框内容&apos;);&quot;&gt;按钮&lt;/button&gt;</span><br></pre></td></tr></table></figure>

<h2 id="a标签的超链接"><a href="#a标签的超链接" class="headerlink" title="a标签的超链接"></a>a标签的超链接</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;a href=&quot;javascript:alert(&apos;警告框内容&apos;);&quot;&gt;超链接&lt;/a&gt;</span><br></pre></td></tr></table></figure>

<h2 id="script标签"><a href="#script标签" class="headerlink" title="script标签"></a>script标签</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">&lt;script&gt;</span><br><span class="line">    alert(&quot;警告框内容&quot;);</span><br><span class="line">&lt;/script&gt;</span><br></pre></td></tr></table></figure>

<p>此方法会在浏览器加载完之后马上出现。</p>
<h2 id="外部文件"><a href="#外部文件" class="headerlink" title="外部文件"></a>外部文件</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;script src=&quot;绝对路径&quot;&gt;&lt;/script&gt;</span><br></pre></td></tr></table></figure>

<p>该路径下写下js文件的具体内容（推荐此方法）</p>
<ul>
<li>可以在不同文件内同时引用</li>
<li>结构清晰</li>
<li>script标签一旦用于引入外部文件，就不能再编写代码了，即使编写浏览器也会忽略</li>
<li>如果需要，可以再创建一个script标签用于编写内部代码（执行顺序按代码位置，JS按代码从上到下执行）<blockquote>
<h3 id="lt-script-gt-一般写在body标签下"><a href="#lt-script-gt-一般写在body标签下" class="headerlink" title="&lt;script&gt;一般写在body标签下"></a><code>&lt;script&gt;</code>一般写在body标签下</h3></blockquote>
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